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Virus:TR/Dldr.Small.jch.2
Date discovered:27/03/2009
Type:Trojan
Subtype:Downloader
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:14.848 Bytes
MD5 checksum:d5b62bbd6e3894864776d00c83a742b2
IVDF version:7.01.02.228 - Friday, March 27, 2009

 General Aliases:
   •  Mcafee: W32/Koobface.worm.a virus
   •  Sophos: W32/Koobfa-Gen
   •  Panda: W32/Koobface.AJ.worm
   •  Eset: Win32/Koobface.NBA
   •  Bitdefender: Worm.Koobface.A


Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003


Side effects:
   • Downloads a malicious file
   • Drops malicious files
   • Registry modification

 Files It copies itself to the following location:
   • %WINDIR%\ld03.exe



It deletes the initially executed copy of itself.




It tries to download a file:

The locations are the following:
   • http://ram06032009.biz/**********
   • http://fdns6mar09.info/**********
   • http://er06032009.biz/**********
   • http://nua06032009.biz/**********
Further investigation pointed out that this file is malware, too.

 Registry One of the following values is added in order to run the process after reboot:

  [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "sysldtray"="%WINDIR%\ld03.exe"

 File details Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

Description inserted by Petre Galan on Monday, November 30, 2009
Description updated by Petre Galan on Wednesday, December 2, 2009

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